Taylor Swift is donating 1 million dollars (€880k) to Louisiana after torrential rains caused massive flooding in the state and killed at least 11 people.

Swift told The Associated Press that Louisiana residents graciously welcomed her when she kicked off the US dates of her 1989 World Tour in the state last year.

Richard Rossi and his grandson wade through water after their home was flooded in St Amant, Louisiana. Photo: Reuters

"We began The 1989 World Tour in Louisiana, and the wonderful fans there made us feel completely at home. The fact that so many people in Louisiana have been forced out of their own homes this week is heartbreaking," the 26-year-old said.

The flooding is some of the worst in Louisiana history, damaging at least 40,000 homes

More than 60,000 people have registered for disaster aid from the Federal Emergency Management Agency after widespread flooding hit the state.

"I encourage those who can to help out and send your love and prayers their way during this devastating time," Swift said.

Flooded homes along the Tangipahoa River near Amite, Louisiana. Photo: Ted JacksonNOLA.com The Times-Picayune via AP

Over 30,000 people have been rescued since Friday, with more being brought to safety by the hour.

There have been scattered reports of looting, and Governor John Bel Edwards said parishes with widespread damage would be placed under curfew.